http://joanneliu.com/OLD/jsl2007/downloads/pdf/trench_warfare.pdf
History: Hammurabi’s Code
http://joanneliu.com/OLD/jsl2007/downloads/pdf/lth4-4.pdf
History: Thomas Jefferson and the Declaration of Independence
http://joanneliu.com/OLD/jsl2007/downloads/pdf/lth4-3.pdf
History: French Revolution Fashion
http://joanneliu.com/OLD/jsl2007/downloads/pdf/lth4-1.pdf
History: Barbed Wire and the American West
http://joanneliu.com/OLD/jsl2007/downloads/pdf/history2007feb.pdf
Chinampas- Building Your Own Floating Garden
http://joanneliu.com/OLD/jsl2007/downloads/pdf/chinampas.pdf